Abstract
To understand the origin of the ferroelectricity in InMnO3, single crystals with average size of 1mm were grown in PbF2 flux at 950°C. The results of single crystal X-ray diffraction, second harmonic generation and piezoresponse force microscopy studies of high-quality InMnO3 single crystals reveal that the room-temperature state in this material is ferroelectric with P63cm symmetry. The polar InMnO3 specimen undergoes a reversible phase transition from non-centrosymmetric P63cm structure to a centrosymmetric P63/mmc structure at 700°C as confirmed by the in situ high-temperature Raman spectroscopic and synchrotron X-ray diffraction experiments.
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